Re: [time-nuts] optically excite a quartz crystal?

Optical excitation of quartz resonators: Electronics Letters , Volume 18, Issue 9 , 29 April 1982, p. 381 – 382 Bruce ___ time-nuts mai

Re: [time-nuts] optically excite a quartz crystal?

Ya, I remember those FT243s. I used some when I was a novice KN4ODS. Regards. Max. K 4 O DS. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Woodworking site http://www.angelfire.com/electronic/funwithtubes/Woodw

Re: [time-nuts] optically excite a quartz crystal?

Hi The WWII era FT-243 is one example of a crystal that has the active portion of the electrodes separated from the resonator by an air gap. There are lots of similar holders from that era that do pretty much the same thing. Non-contacting electrodes are not very new. Bob On Apr 20, 2014, at

Re: [time-nuts] optically excite a quartz crystal?

It seems that it would be relatively easy to apply an electric field to a quartz plate without actually making physical contact. However, Star Trek's force field hasn't been invented yet so there must be some way to support the plate. If you could arrange to support it on the nodes you could e

Re: [time-nuts] optically excite a quartz crystal?

Quartz is piezoelectric, so it deforms due to electrostatic fields and vice versa. This is exactly what is being used in quartz oscillators. For the BVA, the resonator is hanging in bridges of the same quartz crystal it is being cut out from, and the orientation of the blank is such that these b

Re: [time-nuts] NTP and Oncore UT+

I tried to run a UT+ based ref clock with no PPS. I wanted to use the PPS but it was not working because I was using a long cable with no drivers. I gave up and moved the NTP server physically close to the GPS receiver and it worked. With no reliable PPS the reference clock got rejected. What

[time-nuts] TEST 123... please ignore.....

-Brian, WA1ZMS/4 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

[time-nuts] testing thanks to Yahoo....please ignore.

-Brian, WA1ZMS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] FS700 Loran-C Frequency Standard Schematics

For large copies I have taken them to the county clerk's office or a surveyor's office. They can make a copy for you at a reasonable price or free most of the time. Take them donuts!73, Bill, WA2DVU Cape May -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@f

Re: [time-nuts] NTP and Oncore UT+

On Sun, Apr 20, 2014 at 2:24 PM, Hal Murray wrote: > I don't have a UT+, but I'd be very surprised if NTP didn't work without > PPS. > Currently (based on the comments) the driver won't start and in a previous incarnation it actually stopped NTPD. ___

Re: [time-nuts] optically excite a quartz crystal?

Hi Corby, On 04/20/2014 07:35 PM, cdel...@juno.com wrote: After reading about how the BVA oscillators avoid the problems of "on crystal" electrodes I was wondering if anyone has tried to optically excite a quartz crystal in an oscillator? (Use a modulated laser to drive the bare crystal, and a

Re: [time-nuts] optically excite a quartz crystal?

If laser excitation won't work, how about sound, as an opera singer breaking a glass? Use feedback control to bring the driven crystal to resonance with the "free" crystal. Might need to go down to 100 KHz to make this practical. Speaking of practical, how would you levitate the free crystal? Bi

Re: [time-nuts] optically excite a quartz crystal?

On Sun, 20 Apr 2014 10:35:08 -0700 wrote: > After reading about how the BVA oscillators avoid the problems of "on > crystal" electrodes I was wondering if anyone has tried to optically > excite a quartz crystal in an oscillator? > > (Use a modulated laser to drive the bare crystal, and a photode

Re: [time-nuts] optically excite a quartz crystal?

In message , cdel...@juno.com writes: >After reading about how the BVA oscillators avoid the problems of "on >crystal" electrodes I was wondering if anyone has tried to optically >excite a quartz crystal in an oscillator? I can see optical detection, but I have a hard time imagining how you would

Re: [time-nuts] FS700 Loran-C Frequency Standard Schematics

My Fujitsu can duplex scan up to something like 40 x 12 inches. -Chuck Harris Magnus Danielson wrote: Nigel, On 04/20/2014 03:43 PM, gandal...@aol.com wrote: Hi Magnus Thanks for the reply. I was aware of that, and the $35 previously mentioned in the time-nuts archives for an original manua

Re: [time-nuts] FS700 Loran-C Frequency Standard Schematics

Nigel, On 04/20/2014 03:43 PM, gandal...@aol.com wrote: Hi Magnus Thanks for the reply. I was aware of that, and the $35 previously mentioned in the time-nuts archives for an original manual from SRS doesn't sound too bad, but they don't seem to list the FS700 these days and for some other k

Re: [time-nuts] NTP and Oncore UT+

b...@evoria.net said: > The reference pages indicate that a PPS interface is "required". Most times when somebody says that PPS is "required", they leave off the "for decent timekeeping". I don't have a UT+, but I'd be very surprised if NTP didn't work without PPS. You can add "noselect" to t

[time-nuts] FS700 manual

Hi all, I have a papermanual for the FS700, but I havn't scanned it yet, I could send some photos of the schematics to you Nigel if you want, to start with. Best Regards, Mikael Alexandersson ___ time-nuts mailing list -- time-nuts@febo.com To unsub

[time-nuts] optically excite a quartz crystal?

After reading about how the BVA oscillators avoid the problems of "on crystal" electrodes I was wondering if anyone has tried to optically excite a quartz crystal in an oscillator? (Use a modulated laser to drive the bare crystal, and a photodetector setup to detect and provide feedback?) Seems

Re: [time-nuts] I can't get a nice waveform from my rubidium !

If your scope probe is 1:1 (or set to 1:1 if it has a switch), be aware that most 1:1 scope probes have high capacitance and not much bandwidth. I have as number of 100MHz Tektronix scope probes (in the 10:1 setting) that have a specified bandwidth of 6 MHz in the 1:1 setting. That would definit

Re: [time-nuts] FS700 Loran-C Frequency Standard Schematics

Hi Magnus Thanks for the reply. I was aware of that, and the $35 previously mentioned in the time-nuts archives for an original manual from SRS doesn't sound too bad, but they don't seem to list the FS700 these days and for some other kit they now have the manuals priced at $100 each. I

Re: [time-nuts] I can't get a nice waveform from my rubidium !

Claude, your output is a square wave on 50 Ohm as write close the connector. Use this filter to have a clean sinewave  output. http://www.timeok.it/files/5_and_10mhz_low_pass_notch_filter.pdf Luciano www.timeok.it On Thu 17/04/14 7:32 AM , Claude Fender wrote:Hello List, I've recently bou

Re: [time-nuts] Very slow freq. counter / event counter

On 18.04.2014 19:17, Andrea Baldoni wrote: Hello. In the lab, I would like to have an event counter that can double as frequency/period counter, with maximum clock rate in the order of the tens of Hz or so, better with TIC function (aka "chronometer"). Resolution need not be better than 1/100s,

Re: [time-nuts] FS700 Loran-C Frequency Standard Schematics

They are found in the printed manual. Speaking of which, I need a antenna setup for mine. Cheers, Magnus On 04/20/2014 12:03 AM, gandal...@aol.com wrote: I have a manual for the Stanford Research FS700 but it's lacking the schematics, and so far I've been unable to find them. I anyone has cop